Gsoc

It´s new pull request to update apache-rat-core.
Changes inside:
-Delete tag @autor
-Format Code.
-Apply PMD rules.
-Changing test.
-Coverage up 1% Before 76% after 77%
-Add java doc.
-Delete RatException that there aren´t used: 
-RatHeaderAnalysisException
-RatReportAnalysisResultException
-RatDocumentAnalysisException
-UnsuitableDocumentException